Blade adjusting mechanisms for rotary paper cutters



G. A. MEAD Dec. 26, 1967 BLADE ADJUSTING MECHANISMS FOR ROTARY PAPERCUTTERS 4 Sheets-Sheet 1 Filed May 5, 1966 FlG INVENTOR GILE A. MEADATTORNEYS Dec. 26, 1967 cs. A. MEAD I 3,359,843

BLADEADJUSTING MECHANISMS FOR ROTARY PAPER CUTTERS Filed May 5, 1966 4Sheets-Sheet 2 GILE A. MEAD INVENTOR,

ATTORNEYS G. A. MEAD Dec. 26, 1967 BLADE ADJUSTING MECHANISMS FOR ROTARYPAPER CUTTERS Filed May 5, 1966 4 Sheets-Sheet w wI GILE A. MEAD-XNVENTOR.

ATTORNEYS Dec. 26, 1967 G. A. MEAD 3,359,843

BLADE {XDJUSTING MECHANISMS FOR ROTARY PAPER CUTTERS Filed May 5, 1966 I4 Sheets-Sheet 4 322 33I 323 3|? o d 330 3|4 l 342 f v 324 I 342 I 3|s v'lll' 6 GILE A.MEAD

I NVENTOR.

ATTORNEYS United States Patent 3,359,843 BLADE ADJUSTING MECHANISMS FORROTARY PAPER CUTTERS Gile A. Mead, Hoquiam, Wash, assiguor t0 Lamb-GraysHarbor (10., Inc., Hoquiam, Wash. Filed May 5, 1966, Ser. No. 547,879 14Claims. (Cl. 83-349) ABSTRACT OF THE DISCLOSURE Adjusting meansemploying relatively rotatable eccentric mounting assemblies permittingrelative adjustment of a rotatable fly knife and a coacting knife blade.The adjusting means may operate on the ends of the fly knife mandrel, onthe center of the mandrel, or on the coacting knife blade.

This application is a continuation-in-part of application S.N. 406,458,filed Oct. 26-, 1964, now abandoned.

This invention relates to paper cutters of the type which employ arotary fly knife. Moreparticularly, this invention relates to mechanismsfor adjusting the position of rotary fly knives which respect to acoacting blade.

Paper cutters employing rotary fly knives are commonly used to cutstrips of fiber board, card board, pulp, as well as paper of variouskinds, from sheet material continuously advanced through the papercutter between the fly knife and a coacting knife blade. The cuttingaction is provided by rotating an elongated fly knife in close proximityto either a stationary or a rotating blade. The major problemencountered in these paper cutters is the difliculty in adjusting therelative positions of the rotary fly knife and the coacting blade toobtain a proper cutting action across the entire width of the sheetmaterial advanced through the paper cutter.

Attempts to solve the problem in prior paper cutters resulted in flyknife adjusting mechanisms that could be used only when the paper cutterwas stopped and the fly knife stationary. After adjustment, the papercutter had to be restarted and the cutting action observed to ascertainwhether a proper and suitable adjustment had been made. Use of this typeof adjusting mechanism is undesirable because of the amount of papercutter down time required to effect any adjustment and because of theinability to determine the adequacy of adjustment at the instant thatthe adjustment is made.

This problem is compounded when the sheet material to be cut isrelatively thick or when several layers of sheet material are to be cutsimultaneously or when the sheet material to be cut is extremely wideonthe order of 200 inches or wider. When unusually thick or unusually widesheet material is to be cut, the center portion of the fly knife willtend to deflect away from a coacting blade during a cutting actionthereby producing an uneven cut. Attempts to solve this compoundedproblem in prior cutters resulted in fabricating supporting mandrels forfly knives with larger diameters and thicker shells to restrict flyknife deflection. Use of large diameter supporting mandrels, howeverprevents cutting the sheet material into relatively short sectionsbecause the large diameter mandrel prevents locating associated handlingequipment for the cut sections close enough to the mandrel to pick upthe relatively short sections.

A primary object of this invention is to provide for adjusting a rotaryfly knife relative to a coacting blade While the fly knife is in motion.Another object is to provide such a means whereby the effect of flyknife adjustment can be ascertained as the adjustment is made. A furtherobject is to provide means for independently adjusting the centerportion and the ends of a fly knife 3,359,843 Patented Dec. 26, 1967relative to a coacting blade while the fly knife is in motion. Anotherobject is to permit the use of long fly knife mandrels of small diameterby employing such means to counteract fly knife deflection. Stillanother object is to provide means for adjusting a coacting bladerelative to the rotary fly knife while the fly is in motion. These andother objects and advantages of this invention will become apparent fromthe following description in conjunction with the accompanying drawings,of which:

FIG. 1 is a top plan view of a paper cutter embodying the improvementsof the present invention therein; a medial portion being removed toshorten the view;

FIG. 2 is an elevation of the paper cutter of FIG. 1 as seen from Whatis herein designated as. its idle end;

FIG. 3 is an enlarged cross sectional detail taken on line 3-3 in FIG.1;

FIG. 4 is a vertical sectional detail taken on the line 4-4 in FIG. 2;

FIG. 5 is an enlarged sectional detail taken through an end bearinghousing on line 55 in FIG. 2;

FIG. 6 is a schematic showing of an end housing and one of its containedeccentric bearing rings in which the trunnion of the fly knife mandrelis contained;

FIG. 7 is an elevation of the present cutter as seen from what is hereindesignated as its drive end;

FIG. 8 is an elevation view in cross section of the idle end of a flyknife mandrel illustrating another embodiment of this invention;

FIG. 9 is an end elevation view of another embodiment of this inventionwith an anvil blade and the arc of a fly knife shown in phantom;

FIG. 10 is a side elevation view of the FIG. 9 embodiment;

FIG. 11 is a cross section view taken along the line 11-11 in FIG. 9;and

FIG. 12 is a cross-section view taken along the line 1212 in FIG. 10.

This invention improves the adjustability of a paper cutter by providinga micrometer adjusting mechanism to support the section of the papercutter to be adjusted. Exemplary paper cutter sections which couldemploy this micrometer adjusting mechanism include the ends and centersections of a fly knife mandrel, and the ends and center sections of acoating knife blade support. The adjusting mechanism comprises rotatableassembly means rotatable about a first axis and supporting means formounting a paper cutter section having a second axis parallel andeccentric to the first axis. The rotatable assembly means and thesupporting means are interrelated such that rotation of the rotatableassembly about the first axis will shift the second axis, and thus thesupporting means, along an are on a radius defined by the eccentricitybetween the two axis.

When the section to be supported is itself rotatable, such as a flyknife mandrel, the adjusting mechanism is adapted to permit suchrotation. In a preferred embodiment of such an adjusting mechanism, therotatable assembly would comprise a rotatably adjustable bearing ring,and the supporting means would comprise a bearing assembly supportablyconnected to the fly cutter section and carried by the bearing ring in amanner such that the axis of the bearing assembly is slightly eccentricto the axis of the bearing ring. Thus, any rotatable adjustment of thebearing ring will cause the bearing assembly, and the paper cuttersection supported thereby to shift position. FIGS. 1-7 illustrate onesuch embodiment wherein the ends of the rotatable fly knife mandrel aresupported by adjusting mechanisms of this invention. FIG. 8 illustratesanother embodiment wherein the end and center sections of a rotatablefly knife mandrel are supported by adjusting mechanisms of thisinvention.

In the embodiment shown in FIGS. 1-7, a fly knife mounting mandrel isshown equipped at its opposite ends with axially aligned mountingtrunnions 11-11 which are rotatably supported by micrometer adjustingmechanisms 13-13. The mandrel 10 mounts one or more fly blades or knivesF lengthwise thereon for coaction with a stationary anvil blade A thatis mounted by a supporting base B as shown in FIGS. 1, 2 and 7. Theadjusting mechanisms are contained in housings 14-14 which are disposedupon horizontal base bars 15-15 for horizontal shifting adjustment. Thebase bars 15-15 are of inverted channel formation and are mounted andfixed in parallel relationship on a base plate '16 as shown in FIGS. 2and 7. The two end housings 14-14 are horiz'ontally adjusted by screws42 and 43 shown in FIGS. 1, 2 and 7, that are mounted in plates 44 fixedto the base bars 15-15.

The housings 14-14 are one piece castings as shown in dash lines in FIG.6. Each casting provides a bearing ring enclosing band, split at oneside as at 17 in FIGS. 2 and 7. Each housing is provided with face plate14 14f, as shown in FIG. 4, which mount bearing seals 12x-12x to retainlubricant within the housing.

Each micrometer adjusting mechanism comprises a bearing ring 18 ofannular formation having inside and outside circumferences that aresl-ightly eccentric to each other as shown somewhat exaggerated in FIG.7, the centers being designated at a for the outside circumference at bfor the inside circumference. The bearing rings 18 are retained in theirrespective circular band-like enclosing housings 14 between the annularface plates 14 14 As shown in FIG. 4, these face plates are secured toopposite ends of the bearing rings 18 by bolts 14b. Each bearing ring 18is seated On a suitable bushing 19 located on the lower portion of thehousing 14.

Each bearing ring 18 is provided in its outside circumference with anencircling band of gear teeth 18! whereby it may be rotatably adjustedby turning a worm gear spindle 19 that is meshed therewith as shown inFIGS. 4 and 6. Spindle 19 is rotatably journaled in a horizontalposition across the top edge and in the plane of bearing ring 18 withinthe top portion of housing 14. The adjustment of rings 18-18 isaccomplished by turning the spindles 19 by means applied to wrench heads46-46 at their outer ends to which the operator has easy and readyaccess.

The trunnions 11-11 extend through the housings 14- 14 and are supportedwithin the inside circumference of the bearing rings 13-18 by bearingassemblies 12-12. These bearing assemblies permit the trunnions 11-11 tofreely rotate, their axis of rotation corresponding to center point b inFIG. 7.

Each of the bearing ring housings 14-14 has paired clamping screws 35-35applied through the end portions that are separated by the slits 17.These screws may be tightened for drawing the separated ends of eachhousing together, thus to clamp the enclosed band portion of eachhousing about the bearing ring to receive it in any position of rotaryadjustment. When an adjustment is to be made, these clamping screws 35are first loosened, the expanding tension of the housing being such thatthe slit 17 automatically opens with the loosening of the screws. Theamount of slit opening is controlled by adjustment of locked cap screws40 that are positioned between the paired clamping screws 35-35 throughthe ends of the housing at the splits 17 as shown in FIGS. 1 and 3.After loosening the clamping screws, the worm gear spindle 19 may beturned to rotate the respective bearing ring 18. Because of theeccentricity of the center points a and b, rotation of the ring aboutits center point a will cause the center point b to shift position alongan arc in a radius defined by a line beween points a and b. Thus, inFIG. 7, rotation of the bearing ring 18 counterclockwise in FIG. 7 willshift the trunnion center point along an arc from point b to point athereby raising the trunnion upward and to the left as shown somewhatexaggerated in FIG. 7. This shift in position would be employed to raisethe cutting edge of the fly knife F along an identical arc upward andtoward the cutting edge of anvil blade A, the anvil blade being locatedto the left of FIG. 7 as shown in FIG. 2.

A rough adjustment could be made by turning screws 42 and 43 tohorizontally shift the housing 14-14 toward the anvil blade such thatthe fly knife was in close proximity thereto. Then the fine micrometeradjustment by adjusting mechanisms 13-13 would be made to accuratelyposition the fly knife with respect to the anvil blade. The extent ofmicrometer adjustment that is made in the relationship of blades A and Fmay be noted by observing the extent of travel of marker plates 30 thatare fixed to the outside faces of the face plates 14] as in FIGS. 2, 4and 7 in reference to graduated blanks 31 fixed to the housing 14-14also as shown in FIGS. 2, 4 and 7. Face plates 14 are bolted to bearingring 18 and rotate therewith on bearing seals 12x and thus adjustment ofthe bearing rings 18 turns the plates 14] accordingly and the graduatedblanks 31 remain stationary.

In practice, the amount of eccentricity between center points a and b isa small fraction of an inch so that the degree of adjustability isextremely fine, being on the order of 0.001 inch for each 0.25 inch ofrotation of the bearing rings.

In the embodiment shown in FIG. 8 a cylindrical fly knife mountingmandrel in the form of a cylindrical tube, is rotatably supported atopposite ends in micrometer adjusting machanism 113. The center sectionis rotatably supported by a shaft 120 that extends through the mandrel110 and is rotatably carried at its opposite ends in micrometeradjusting mechanisms 213. The essential components of the adjustingmechanisms 113 and 213 are substantially similar to the adjustingmechanism 13 and hence the same reference numerals in multiples of 100and 200 are used to designate these substantially similar components.Reference to the discussion above of the components of the adjustingmechanism 13 can be had to ascertain the op eration of these similarcomponents of the adjusting mechanism 113 and 213.

There are some differences between adjusting mechanisms 113 and 213 andadjusting mechanism 13 that are dictated by the concurrent use of twosuch adjusting mechanisms on each end of the fly knife-mandrel. Thediameter of adjusting mechanism 113 is larger than that of adjustingmechanism 13 for mandrels of the same size because a reduced diametertrunnion, as at 11, cannot be employed when a shaft, as at 120, mustextend through the mandrel. The two housings 114 and 214 on each mandrelend are separate units to permit independent clamping of the bearingrings 118 and 218. The face plates 114 and 214 and the bearing seals112x and 212x may have different structures dictated by the use of twosuch adjusting mechanisms at each mandrel end. The housings 114 and 214are adapted to be independently adjusted on bases and 215, respectively,in the manner disclosed in the FIGS. 1-7 embodiment.

The shaft 120 preferably is shrink-fitted to the interior of the mandrelcenter section to ensure that the shaft and the mandrel will act as aunit in the center section. The end sections of the shaft are of reduceddiameter so that the only contact between the shaft and the mandrel isat the center section of each. The shaft is preferably tapered as shownup to its center section.

A major advantage of the use of two adjusting mechanisms on each mandrelend, over the use of one, exists where a combination of small mandreldiameter and relatively great mandrel length creates the problem of flyknife deflection at cutting speeds. This combination can occur where asmall mandrel diameter is required to reduce costs, or to cut sheetmaterial into short sections, or where a relatively long mandrel isrequired to handle wide sheet material. Either or both of the adjustingmech-t anisms or each end of the mandrel can be adjusted while the papercutter is in operation.

FIGS. 9 to 12 depict a micrometer adjusting mechanism suitable forsupporting a stationary blade. In FIG. 9 the section of an anvil and ananvil blade are shown in phantom and the arc traversed by the cuttingedge of a fly knife is also shown in phantom. This embodiment of anadjusting mechanism comprises a housing 314, split at one side as at317, in which a cylindrical bearing member 318 is rotatably mounted.

The housing is mounted on horizontal base bars 315- 315 for horizontalshifting adjustment. These base bars are of inverted channel formationand mounted and fixed in parallel relationship on a base plate 316. Thehousing is horizontally adjusted by screws 342 and 343 that are mountedin plates 344 fixed to the base plates 316.

The bearing member 318 is provided with an encircling band of gear teeth318t whereby it may be rotatably adjusted by turning a worm gear spindle319 that is meshed therewith. Spindle 319 is rotatably journalled in ahorizontal position across the bottom edge and in the plane of the gearteeth 318i within the bottom portion of housing 314. The adjustment ofbearing member 318 is accomplished by turning spindle 319 by meansapplied to wrench head 346 at its outer end.

Cylindrical stub shafts 321-321 extend from each end of the bearingmember 318 and are preferably integral therewith. The axis of these stubshafts are in alignment and are slightly eccentric of the axis of thebearing member 318, as shown somewhat exaggerated in FIG. 9, the centersbeing designated at d for the bearing member and at e for the stubshafts. An anvil support member 322 is mounted on the stub shafts bypillow blocks 323-323 and stands above the housing 314. The upper halvesof the pillow blocks are integral with the anvil support member 322 andthe lower halves of the pillow blocks are bolted to the respective otherhalves by bolts 324.

The housing 318 has paired clamping screws 325 applied through the endportions that are separated by slit 317. These screws may be tightenedfor drawing the separated ends of the housing together, thus to clampthe housing about the bearing member to secure it in any position ofrotary adjustment. When an adjustment is to be made, these clampingscrews 335 are first loosened, the expanding tension of the housingbeing such that the slit 317 automatically opens with the loosening ofthe screws. After loosening the clamping screws, the worm gear spindle319 may be turned to rotate the bearing member 318. Because of theeccentricity of the axis of the bearing member and the stub shafts,rotation of the bearing member about its axis d will cause the axis 2 ofthe stub shaft to shift position along an are on a radius defined by aline between points d and e, and hence to shift the anvil and anvilblade supported on the anvil support member along an identical arc.

A rough adjustment could be made by turning screws 342 and 343 tohorizontal shift the housing 314 toward the fly knife mandrel. Then thefine micrometer adjustment would be made to accurately position theanvil blade with respect to the fly knife. The extent of the micrometeradjustment that is made may be noted by observing the extent of travelof a marker plate 330 that is fixed to the end of one of the stub shaftsin reference to graduated blanks 31 fixed to the outside face of one ofthe saddle blocks.

In practice, the amounts of eccentricity between the center points d ande is a small fraction of an inch so that the degree of adjustability isextremely fine.

The anvil adjusting mechanism can be employed to support the ends of theanvil blade and also to support the anvil blade at points between theends. Use of adjusting mechanisms at such intermediate points could beused in conjunction with the use of adjusting mechanisms on the flyknife mandrel, and might supplant their use on a fly knife mandrel undersome paper cutting conditions.

It is believed that the invention will have been clearly understood fromthe foregoing detailed description of my now-preferred illustratedembodiment. Changes in the details of construction may be resorted towithout departing from the spirit of the invention and it is accordinglymy intention that no limitations be implied and that the hereto annexedclaims be given the broadest interpretation to which the employedlanguage fairly admits.

What is claimed is:

1. In a paper cutter having a knife blade, a rotatable mandrel and a flyknife mounted on said mandrel for cutting co-action with said knifeblade for cutting sheet material passed between said fly knife and saidknife blade, the improvement comprising adjusting means supporting asection of said paper cutter for adjusting the relative positions ofsaid fly knife and said knife blade with respect to each other; saidadjusting means comprising rotatable assembly means rotatable about afirst axis, and supporting means for mounting the paper cutter sectionhaving a second axis parallel and eccentric to said first axis, saidrotatable assembly means and said supporting means being interrelatedsuch that rotation of said rotatable assembly about said first axiscauses said second axis to shift position along an arc on a radiusdefined by the eccentricity between the two axis; said knife bladecomprising a stationary anvil blade; and said a'djusting means beingadapted to support a section of said anvil blade and comprises arotatably adjustable cylindrical bearing member, a cylindrical supportmember connected to and extending from each end of said bearing memberand having aligned axis parallel to and slightly eccentric to thebearing member axis, means for mounting said anvil blade on said supportmembers, and mean for rotatably adjusting said bearing member.

2. A paper cutter comprising a base, a pair of laterally spaced housingsmounted on said base, an anvil blade fixedly mounted between saidhousings, a rotatably driven mandrel extended between said housings andhaving mounting trunnions at its ends rotatably supported therein; a flyblade mounted on the mandrel for co-action with the anvil blade forcutting strips of paper passed between said blades, paired bearing ringsrotatably fitted in said housings in axial alignment, bearing assembliesmounting the trunnions of said mandrel equally eccentrically in saidbearing rings and means mounted in said housings for rotatably adjustingsaid bearing rings thus to adjust the fly blade relative to the anvilblade for paper cutting.

3. A paper cutter according to claim 2 wherein said ring bearings areexteriorly formed with worm threads; and including a ring adjusting wormshaft mounted in each housing in driving mesh with the threads of thecorresponding bearing ring and adapted to be rotated for adjusting thecorresponding ring to establish blade shearing relationship.

4. A paper cutter according to claim 2 wherein each housing is ofband-like formation to enclose the bearing ring for rotative adjustment:and wherein said band is split radially at one side of the circularbearing containing opening thereof; and including a clamping screwapplied through the radial split of each housing to tighten the bandagainst the bearing ring to retain bearing ring adjustment.

5. A paper cutter according to claim 2 wherein the bearing rings arerotatably contained in their respective housings, have cover platesfixedly applied to opposite faces of the housings about the ringcontaining openings; said cover plates having openings passing thetrunnions therethrough for rotation of the mandrel and rotatablyadjustable with the rings to which they are attached; the ring enclosingportions of the housings having graduations applied thereto, and apointer applied to cover plate to move along the graduations inaccordance with ring adjustment to visually indicate the adjustment ofblade relationship thereby made.

6. A paper cutter according to claim 2 wherein said mandrel iscylindrical; and including a shaft extending through said mandrel andhaving an enlarged center section in contact with the center section ofsaid mandrel; a second pair of housings and a second set of pairedbearing rings rotatably fitted in said second pair of housings in axialalignment, at second pair of bearing assemblies mounting the ends ofsaid shaft equally eccentrically in said second pair of bearing rings,and means mounted in said second pair of housings for rotatablyadjusting said second pair of bearing rings to adjust the center sectionof the fly blade relative to the anvil blade for paper cutting.

7. A paper cutter according to claim 6 wherein said second set ofbearing rings are exteriorly formed with worm threads; and including aring adjusting worm shaft mounted in each second housing in driving meshwith the threads of the corresponding second bearing ring and adapted tobe rotated for adjusting the corresponding ring to establish bladeshearing relationship.

8. A paper cutter according to claim 6 wherein each second housing is aband-like formation to enclose the bearing ring for rotative adjustmentand wherein said band is split radially at one side of the circularbearing containing opening thereof; and including a clamping screwpplied through the radial spilt of each second housing to tighten theband against the bearing ring to retain bearing ring adjustment.

9. A paper cutter according to claim 6 wherein the second bearing rings,as rotatably contained in their respective housings, have cover platesfixedly applied to opposite faces thereof with peripheral edges slidablyoverlapped with faces of the second housings about the ring containingopenings; said cover plates having openings passing said shaft androtatably adjustable with the rings to which they are attached; the ringenclosing portions of the second housings having graduations appliedthereto, and a pointer applied to a cover plate to move along thegraduations in accordance with ring adjustment to visually indicate theadjustment in blade relationship thereby made.

10. A paper cutter according to claim 1, including a housing; andwherein said bearing member is rotatably fitted in said housing andexteriorly formed with worm threads; and wherein said means forrotatably adjusting said bearing member comprises an adjusting wormshaft mounted in said housing in driving mesh with the threads of saidbearing member.

11. A paper cutter according to claim 1 wherein said means for mountingsaid anvil blade comprise an anvil support member, and pillow blocksconnected to said anvil support member and mounted on said supportmembers.

12. A paper cutter according to claim 11 wherein one of said pillowblocks has graduations applied thereto; and including a pointer attachedto the end of the corresponding support member to move along thegraduations in accordance with bearing member adjustment.

' 13. A paper cutter comprising a base; a first pair of laterally spacedhousings mounted on said base; an anvil blade between the firsthousings; a rotatably driven cylindrical mandrel extending between saidfirst housings; a fiy blade mounted on the mandrel for co-action withthe anvil blade for cutting strips of paper passed between the blades;paired bearing rings rotatably fitted in said first housings in axialalignment; first bearing assemblies mounting the ends of said mandrelequally eccentrically in said bearing rings; first means mounted in saidfirst housings for rotatably adjusting said bearing rings thus to adjustthe ends of said fly blade relative to the anvil blade for papercutting; a shaft extending through said mandrel and having an enlargedcenter section in contact with the center section of said mandrel; asecond pair of housings and a second set of paired bearing ringsrotatably fitted in said second pair of housings in axial alignment; asecond pair of bearing assemblies mounting the ends of said shaftequally eccentrically in said second pair of bearing rings; second meansmounted in said second pair of housings for rotatably adjusting saidsecond pair of bearing rings to adjust the center section of the flyblade relative to the anvil blade for paper cutting; adjusting meansadapted to support a section of said anvil blade comprising a rotatablyadjustable cylindrical bearing member, a cylindrical support memberconnected to and extending from each end of said bearing member andhaving aligned axis parallel to and slightly eccentric to the bearingmember axis, means for rotatably adjusting said bearing member.

14. In a paper cutter having a knife blade, a rotatable cylindricalmandrel and a fly knife mounted on said mandrel for cutting co-actionwith said knife 'blade for cutting sheet material passed between saidfly knife and said knife blade, the improvement comprising a shaftextending axially into said mandrel and having an enlarged sectionconnected to the mandrel center section; adjusting means supporting asection of said shaft for adjusting the relative positions of said flyknife and said knife blade with respect to each other, comprising arotatably adjustable bearing ring, and a bearing assembly supportablyconnected to said shaft and carried by said bearing ring in a mannersuch that the axis of said bearing assembly is slightly eccentric andparallel to the axis of said bearing ring, and means for rotatablyadjusting said bearing ring; and means rotatably mounting the ends ofthe cylindrical mandrel independently of said adjusting means.

References Cited UNITED STATES PATENTS 2,100,930 11/1937 Aiken 83-349 X2,397,603 4/1946 Hackett 83-344 X 2,711,935 6/1955 Miles 30862 ANDREW R.JUHASZ, Primary Examiner.

1. IN A PAPER CUTTER HAVING A KNIFE BLADE, A ROTATABLE MANDREL AND A FLYKNIFE MOUNTED ON SAID MANDREL FOR CUTTING CO-ACTION WITH SAID KNIFEBLADE FOR CUTTING SHEET MATERIAL PASSED BETWEEN SAID FLY KNIFE AND SAIDKNIFE BLADE, THE IMPROVEMENT COMPRISING ADJUSTING MEANS SUPPORTING ASECTION OF SAID PAPER CUTTER FOR ADJUSTING THE RELATIVE POSITIONS OFSAID FLY KNIFE AND SAID KNIFE BLADE WITH RESPECT TO EACH OTHER; SAIDADJUSTING MEANS COMPRISING ROTATABLE ASSEMBLY MEANS ROTATABLE ABOUT AFIRST AXIS, AND SUPPORTING MEANS FOR MOUNTING THE PAPER CUTTER SECTIONHAVING A SECOND AXIS PARALLEL AND ECCENTRIC TO SAID FIRST AXIS, SAIDROTATABLE ASSEMBLY MEANS AND SAID SUPPORTING MEANS BEING INTERRELATEDSUCH THAT ROTATION OF SAID ROTATABLE ASSEMBLY ABOUT SAID FIRST AXISCAUSES SAID SECOND AXIS TO SHIFT POSITION ALONG AN ARC ON A RADIUSDEFINED BY THE ECCENTRICITY BETWEEN THE TWO AXIS; SAID KNIFE BLADECOMPRISING A STATIONARY ANVIL BLADE; AND SAID ADJUSTING MEANS BEINGADAPTED TO SUPPORT A SECTION OF SAID ANVIL BLADE AND COMPRISES AROTATABLY ADJUSTABLEE CYLINDRICAL BEARING MEMBER, A CYLINDRICAL SUPPORTMEMBER CONNECTED TO AND EXTENDING FROM EACH END OF SAID BEARING MEMBERAND HAVING ALIGNED AXIS PARALLEL TO AND SLIGHTLY ECCENTRIC TO THEBEARING MEMBER AXIS, MEANS FOR MOUNTING SAID ANVIL BLADE ON SAID SUPPORTMEMBERS, AND MEANS FOR ROTATABLY ADJUSTING SAID BEARING MEMBER.